[clang] [C++20][Modules] Fix crash when function and lambda inside loaded from different modules (PR #109167)

[Chuanqi Xu via cfe-commits]

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@@ -532,6 +532,10 @@ class ASTReader
   /// namespace as if it is not delayed.
   DelayedNamespaceOffsetMapTy DelayedNamespaceOffsetMap;
 
+  /// Mapping from FunctionDecl IDs to the corresponding lambda IDs.
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ChuanqiXu9 wrote:

Same here. Let's explain our intention.

https://github.com/llvm/llvm-project/pull/109167